PSLE
Risa had to sew 145 coats. She sewed 8 coats each day from Monday to Friday and 11 each day on Saturday and Sunday. Starting on a Tuesday, on which day of the week did Risa finish sewing all the coats? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Risa sewed on the first week = 4

Number of coats that Risa completed for from Tuesday to Sunday on the first week
= 4 x 8 + 2 x 11 
= 32 + 22
= 54

Number of coats left to sew
= 145 - 54
= 91

Number of coats that Risa could sew per week from second week onwards
= 5 x 8 + 2 x 11
= 40 + 22
= 62

Number of weeks that Risa needed to sew 91 coats
= 91 ÷ 62
= 1 r 29

Number of days that Risa needed to sew 29 coats
= 29 ÷ 8
= 3 r 5

Risa needed 1 more day to finish sewing the remaining 5 coats.

Day of the week that Risa completed her sewing
= 3 + 1
= 4 (Thu)

Answer(s): 4